Abstract
The majority of the known pincer iridium based catalysts for dehydrogenation of alkanes has arene-based backbones. Here, the catalytic activity of aliphatic iridium pincer complexes, viz. the cyclohexane-based phosphine complex (PCyP)IrHCl (4) (PCyP={cis-1,3-bis-[(di-tert-butylphosphino)methyl]cyclohexane}−) and the 2-methylpropane-based phosphinite complex (POCOP)IrHCl (5) (POCOP=1,3-bis-(di-tert-butylphosphinito)-2-methylpropane−), in dehydrogenation of cyclooctane and triethylamine was studied. They give TONs that are in the range of 0–200. In addition, improved procedures for synthesis and metallation of the PCyP ligand (3) are presented.
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